IB Biology HL B3.2.15 Hl Mammalian Heart Adaptations Questions

Explore how the four chambers, septum, valves, tendinous cords, ventricular muscle and coronary supply support one-way pressurized blood flow in IB Biology HL B3.2.15.

Exam points

Identify the four chambers, septum, atrioventricular valves, semilunar valves and major vessels on labelled heart diagrams.
Explain how atrioventricular and semilunar valves open with upstream pressure and close to prevent backflow, including support from tendinous cords.
Relate thick left-ventricular muscle, coronary blood supply and myogenic cardiac muscle to high-pressure systemic pumping.

[Maximum number: 1]

The diagram shows a section through a human heart with the chambers, valves and main blood vessels.

Figure for Question IB Biology HL B3.2.15 Hl Mammalian Heart Adaptations Questions question 1 — IB Biology HL

What are the functions of X and Y ?

To carry oxygenated blood to the
head and body

To prevent backflow into the aorta
when the ventricle relaxes

To carry oxygenated blood to the
head and body

To prevent backflow into the aorta
when the atrium relaxes

To carry deoxygenated blood to
the lungs

To prevent backflow into the atrium
when the ventricle contracts

To carry deoxygenated blood to
the lungs

To prevent backflow into the atrium
when the ventricle relaxes

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IB Biology HL B3.2.15 Hl Mammalian Heart Adaptations Questions question 1